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Employee Information - Summary of Remuneration to Board Members and Presidents in Subsidiaries (Detail) - SEK (kr) kr in Millions | 12 Months Ended
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Dec. 31, 2024 | Dec. 31, 2023
Disclosure Of Remuneration To Board Members And Presidents In Subsidiaries [Abstract] |  |
Salary and other remuneration | kr 535 | kr 459
Of which annual variable remuneration | 112 | 109
Pension costs | kr 36 | kr 36

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- Definition Annual variable remuneration to board members and presidents. + References No definition available. + Details
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Namespace Prefix: | eric_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

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- Definition Disclosure of remuneration to board members and presidents in subsidiaries. + References No definition available. + Details
Name: | eric_DisclosureOfRemunerationToBoardMembersAndPresidentsInSubsidiariesAbstract
Namespace Prefix: | eric_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

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- Definition Remuneration to board members and presidents in subsidiaries of pension costs. + References No definition available. + Details
Name: | eric_RemunerationToBoardMembersAndPresidentsInSubsidiariesOfPensionCosts
Namespace Prefix: | eric_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

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- Definition Salary and other remuneration. + References No definition available. + Details
Name: | eric_SalaryAndOtherRemuneration
Namespace Prefix: | eric_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration